Abstract:In order to gain runaway characteristics of two-way passage axial-flow pump installation, the axial-flow pump model with two-way flow passage installation in Zongyang Pump Station was used as an investigated object. The unsteady flow field in the installation was simulated numerically by using CFX software, based on the RANS equations and RNG k-ε turbulence model. The runaway speeds and flow rates were obtained under different heads. Finally, the unit runaway speed was worked out.The correctness of the numerical simulation was validated by comparison with the experimental results. The internal flow field in the pump installation shows an unstable pattern behind the pump and significant numbers of vertex occur in the outlet passage. The pressure distribution is irregular in the middle of the blade suction side, and a high pressure zone exists on the blade pressure side near the leading edge and on the blade suction side near the trailing edge, respectively. Moreover, the zone area increases with increasing runaway head. Flow separation exists at the blade trailing edge, and a low velocity region exists on the blade leading edge. The results can provide a good reference for design and safe operational management of the axial-pump installation.
[1]刘超, 金燕. 双向流道泵装置内三维流动数值模拟[J]. 农业机械学报, 2011, 42(9):74-78. LIU Chao, JIN Yan. Numerical simulation of three dimensional flow in two way flow pump[J].Transactions of the CSAM,2011, 42(9):74-78.(in Chinese)[2]黄良勇, 吴忠, 张啸,等. 大型双向流道泵装置优化匹配与试验研究[J]. 排灌机械工程学报, 2016, 34(7):602-607. HUANG Liangyong,WU Zhong,ZHANG Xiao,et al. Study on the optimal matching and test of large scale bidirectional pump[J].Journal of drainage and irrigation machinery engineering,2016, 34(7):602-607.(in Chinese)[3]ZOBEIRI A, KUENY J L, FARHAT M, et al. Pump-turbine rotor-stator interaction in generating mode: pressure fluctuation in distributor channel[C]//Proceedings of the 23rd IAHR Smposium on Hydraulic Machinery and Systems, 2006.[4]LUCIUS A, BRENNER G. Unsteady CFD simulations of a pump in part load conditions using scale-adaptive simu-lation[J]. International journal of heat & fluid flow, 2010, 31(6):1113-1118.[5]DING H, VISSER F C, JIANG Y, et al. Demonstration and validation of a 3D CFD simulation tool predicting pump performance and cavitation for industrial applications[C]//Proceedings of the ASME Fluids Engineering Division Summer Meeting, 2011:011101.[6]赵浩儒,杨帆,吴俊欣,等.立式轴流泵装置压力脉动特性的试验[J].流体机械,2017,45(7):12-16,27. ZHAO Haoru,YANG Fan,WU Junxin,et al. Test on pressure pulsation characteristics of vertical axial flow pump[J].Fluid machinery,2017,45(7):12-16,27.(in Chinese)[7]罗宝杰,华路,杜宁江,等.双吸双流道泵气固液三相流动特性分析[J].流体机械,2017,45(7):47-51. LUO Baojie,HUA Lu,DU Ningjiang,et al. Analysis of three phase flow characteristics in double suction double channel pump[J].Fluid machinery,2017,45(7):47-51.(in Chinese)[8]雷可铭,李勇刚,杜宁江,等.双吸双流道泵固液两相流动特性分析[J].流体机械,2016,44(5):31-36. LEI Keming,LI Yonggang,DU Ningjiang,et al. Analysis of solid-liquid phase flow characteristics of double suction double channel pump[J].Fluid machinery,2016,44(5):31-36.(in Chinese)[9]金国栋, 潘志军, 孟金波,等. 斜式轴流泵装置模型的飞逸特性研究[J]. 水动力学研究与进展, 2013, 28(5):591-596. JIN Guodong,PAN Zhijun,MENG Jinbo,et al.Study on the runaway characteristic oblique axial flow pump device model[J].Journal of hydrodynamics, 2013, 28(5):591-596.(in Chinese)[10]潘志军, 陈鲁, 何勇,等. 大型泵站机组飞逸转速的确定及电机强度设计[J]. 浙江水利水电学院学报, 2016, 28(4):19-23. PAN Zhijun,CHEN Lu,HE Yong,et al. Determination and strength design of runaway speed motor pumping station[J].Journal of Zhejiang University of Water Resources and Electric Power, 2016, 28(4):19-23.(in Chinese)[11]徐建叶,张海胜,刘跃飞,等. 大套一站轴流泵装置事故飞逸特性研究[J].中国农村水利水电,2017(6):173-176. XU Jianye,ZHANG Haisheng,LIU Yuefei,et al. Numerical simulation of runaway accident characteristics of the axial pump unit in Datao NO.1 Station[J]. China rural water and hydropower,2017(6):173-176.(in Chinese)[12]王福军, 张玲, 张志民.轴流泵不稳定流场的压力脉动特性研究[J].水利学报, 2007, 38(8):1 003-1 009. WangFujun, ZhangLing, ZhangZhimin. Analysis on pressure fluctuation of unsteady flow in axial-flow pump[J]. Journal of hydraulic engineering, 2007, 38(8):1 003 - 1 009.(in Chinese)